Skin treatment device



FIG. 1 is a front view of a skin treatment device incorporating our new design;

FIG. 2 is a back view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side elevational view thereof, which is substantially identical to a left side elevational view thereof;

FIG. 5 is a front isometric view thereof;

FIG. 6 is a trimetric view thereof; and,

FIG. 7 is a dimetric view thereof. 

The ornamental design for a skin treatment device, as shown and described. 